Poly Shearing

Discussion in 'Strings' started by 300Gkid, Mar 9, 2008.

  1. 300Gkid

    300Gkid Professional

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    Hey, heres the deal. Last summer i had severe poly shearing problems, like i could not get a set of CyberFlash to last mroe than a couple hours. But, this winter, i switched to PHT and had seen no problems. So, thinking i was home free, I strung up my M-fil 300 a couple weeks ago with the setup in my signature (Cyberpower) and yesterday, they sheared and broke at the top of the frame, i was heartbroken as i had thought i finally beat this thing. So, i pulled out my backup which i had yet to string iwth Cyberpower, and had like a month old PHT in it, and after a few minutes, THIS SNAPPED TOO! Now i was really confused, PHT has never snapped on me before. The only thing thats different about these last few weeks is that i have played outdoors for the first time in a while, could that have impacted it? Also, both of these strings were 17g, would it be helpful to go to 16g?

    if you have any ideas of how to stop shearing, or any strings that dont shear, please respond

    thanks
     
    #1
  2. Stan

    Stan Professional

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    If you hit the ball in the center of the stringbed you have no worries.

    Otherwise, I might suggest that the softer copolymers have a greater tendency to shear if they are not installed by a professional who knows how to properly put these strings in racquets. You can not prelace mains, you can not overtighten clamps and you definitely can not be is such a hurry that you kink the string. Most copolymers, properly installed, do not have a shearing problem...at least not any greater likelihood than other strings when shanked. However, when not properly installed they are much more likely to shear. I suspect stringer error.
     
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  3. J011yroger

    J011yroger G.O.A.T.

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    I have gone through literally hundreds of ALU stringjobs and have never sheared a string.

    I don't know if it is because of the ALU being a better quality string and more resistant to shearing, or because I play thin box beamed racquets which don't put as much stress on the string when you frame it, or a combination of the two.

    J
     
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  4. kirbster123

    kirbster123 Banned

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    What's wrong with prelacing copolys?
     
    #4
  5. samej07

    samej07 Rookie

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    im in the same possion as you J011ly. i have played tons of pht jobs and have never sheared a string. the reason i quoted it though is that i play a babolat apdc, which is about as far from your box frames as you can get and i've still never had the problem.

    so i guess you should just aim to hit the ball in the middle. lol. ;)
     
    #5
  6. nickb

    nickb Banned

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    I have never sheared a string...not even poly.

    Could you be kinking the string during stringing or have old grommets?

    Nick
     
    #6
  7. Stan

    Stan Professional

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    Prelaicng copolys adds an extra "bend" (for lack of a better word) to the string. It can create weaknesses that are not necessary. For this reason mains should not be prelaced.
     
    #7
  8. Babb

    Babb Professional

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    Now down to 4 feet behind the baseline.
    What is shearing?
     
    #8
  9. J011yroger

    J011yroger G.O.A.T.

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    When you mishit a ball at the edge of the frame, it puts an incredible amount of stress on the string, and sometimes it will just snap at the very edge of the frame even though the string was not nearly worn enough to break normally.

    That is called shearing, it usually happens right at the very top of the frame.

    J
     
    #9
  10. J011yroger

    J011yroger G.O.A.T.

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    [​IMG]


    That is shearing. Picture stolen from Anton.

    J
     
    #10

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